Tamukeyama Japanese Maple

Overview

Tamukeyama is a weeping, cutleaf (dissectum) Japanese maple prized for deep crimson-red foliage that holds its color through summer better than most other laceleaf types (Acer palmatum var. dissectum 'Tamukeyama'). It forms a low, cascading mound of finely dissected leaves, making it a living sculpture rather than a shade tree. It is also one of the oldest documented Japanese maple selections, valued for both vigor and heat tolerance.

Origin & Background

The parent species, Acer palmatum, is native to Japan, Korea, and parts of eastern China, where it grows as an understory tree in cool, humid woodlands. Tamukeyama is a classic dissectum cultivar that has been cultivated in Japan for centuries, with references dating back to the early 1700s, and it remains a benchmark for red laceleaf maples because of its stronger vigor and better sun and heat resistance than many older red weeping forms.

Appearance

The leaves are deeply dissected, almost fern-like, emerging bright crimson to purple-red in spring and holding a rich burgundy-red through summer heat, when many red laceleafs fade toward green or bronze. In autumn the foliage shifts to a brilliant scarlet before dropping. The habit is a strongly weeping, cascading mound: expect roughly 1.8 to 2.5 m tall and 2.5 to 3.5 m wide at maturity, wider than it is tall, with pendulous branches that drape and layer over time. The small spring flowers are reddish and inconspicuous, followed by winged samaras; the plant is grown for foliage, not bloom.

Why People Grow It - Qualities & Benefits

• Holds deep red color through summer heat better than most red laceleaf maples
• Elegant weeping, cascading form that works as a stand-alone focal point
• Strong three-season interest: crimson spring flush, burgundy summer, scarlet fall
• Naturally compact and slow-growing, ideal for small gardens, containers, and near water features

Care

Light: Full sun to part shade; in hot climates give afternoon shade to prevent leaf scorch, while cooler regions allow more direct sun and richer color. Water: Consistent, even moisture; water deeply during dry spells and never let the root zone fully dry out, but avoid waterlogging. Soil: Rich, well-drained soil high in organic matter; slightly acidic pH (about 5.5 to 6.5) is ideal. Hardiness: USDA zones 5 to 9. Bloom or Season: Grown for foliage; crimson spring emergence, burgundy summer, and scarlet autumn color are the main seasonal draws. Extra: Its signature quirk is better summer heat and sun tolerance than older red laceleafs, though a sheltered spot away from harsh wind still gives the cleanest foliage.

Planting & Propagation

Plant in spring or fall in a sheltered spot with good drainage, setting the graft union at or slightly above soil level and mulching to keep roots cool and evenly moist. Tamukeyama is a named cultivar, so it is almost always propagated by grafting onto seedling Acer palmatum rootstock to keep the foliage color and weeping habit true; seed will not come true. Home gardeners occasionally try layering, but grafting done by nurseries is the reliable method.

Common Problems & Pests

• Leaf scorch and crisped margins from too much hot sun, drying wind, or inconsistent watering
• Aphids, scale, and mites, which can be worse on stressed plants
• Verticillium wilt and various fungal leaf spots and cankers, favored by poor drainage or overhead moisture

Toxicity & Safety

Not on the ASPCA lists. The ASPCA Animal Poison Control Center's plant lists for cats and dogs have no entry for this plant (they do have entries for relatives, such as Acer ginnala and Acer rubrum), and we have no other checked source either way. As a general precaution, discourage pets from chewing woody stems. If a pet chews it and seems unwell, call your vet or a pet poison helpline.

Pros & Cons

Pros

• Superior summer color retention and heat tolerance for a red laceleaf
• Sculptural weeping form that anchors a bed, container, or entryway

Cons

• Slow-growing and comparatively expensive because it is grafted
• Foliage can scorch in exposed, hot, or windy sites without some shade

Best Suited For

• Small gardens, courtyards, and container plantings needing a year-round focal point
• Gardeners in zones 5 to 9 who want reliable red laceleaf color with some heat tolerance

FAQ

How big does Tamukeyama get?

It is slow-growing and stays compact, typically reaching about 1.8 to 2.5 m tall and 2.5 to 3.5 m wide at maturity, spreading wider than it is tall.

Does Tamukeyama keep its red color all summer?

Yes, more reliably than most red laceleaf maples. It holds a deep burgundy-red through summer heat, then turns bright scarlet in fall, though a little afternoon shade in hot climates keeps the foliage cleanest.